Drill-bit.



]. BLASS.

DRILL BIT.

APPLICATlON FILED Davao. 1914.

Patented Nov. 30; 1915.

uuwtoz JOHNEDLRSS To all whom it may concern:

Be it known that I, JonN BLAss, a citizen of the United States, residing at Girardville, in the county oflSchuylkill and 5 State of Pennsylvania, "have invented certain new and usefulImprovements in Drill- Bits, of which the following is 'a specification, reference being had to( the accompany-- mg drawings. 7 j I This invention relates to an improved drill bitand has for its primary object'to provide atool of this character particularly designed for the cutting or d'rilling ofcoal'; whereby the operation'is"greately-facihtated,

and the coal chipped or broken away from the wall in fine particles and pulverizingof the same practically eliminated.

It is a further object provide a drill bit which is so constructed that the same will not hole drilled in the mine wall, but may be very easily and quickly removed therefrom.

It is still another object of the invention to provide a drill'rod made up of a plurality of sections, and improved meansfor easily and quickly connecting j any IlLlInb6I"0f"tliG sections together or disconnecting the same;

With the above and other objects in view,

construction, combination ment of parts as will behereinafter referred to andmore particularly'pointed out in'the specification and claims. r e I Figure l is a perspective view illustrating 2 is a "similar view showing a slightly modithe sections of the drill similar view showing a form of the joint; and perspective view of the endoff one of the drill rod sections shown in F ig. 4.

In the ordinary'drill now in common use rod, Fig. 1 is a with the drilling thereto. In the use of such a drill, when mine wall, same in the application of pressure there- Specificaition of Letters Patent.

of the invention to becomewedged in the 1 the invention consistsin' novel featuresl'o?f and arrange-- one embodiment of my improveddrill; F ig.;

fied form of the drill point. Fig. 3 is a 1011- gitudinal section through the joint between slightly modified Fig. 5 is a detail for drilling coal, theendof the drill rod or centrally located 0 eling bit disposer v in divergent relationthe drill is inserted into the hole in the I upon a turning movement I of the 5 to, the central chiseling bit cuts away the TE T TES PATENT orricn JOHN BtAss, or GIRARJJVILLE, PENNSYLVANIA.

w Patented No 30, 1915.

Application fiia December 30, 1914. SerialNo. 879,756.

1 coal and the divergently disposed bits gradually become embedded in the coal wall so that spurs or projections of coal are produced between the longitudinal edges of the chisel and said angularly extending bits. The opposed edges of these cutting bits, grind or pulverize the coal. As the end of the bit is flared or widened, it. is obvious that, as this cutting progresses, the inner end of the hole in the mine wall is gradually enlarged Thus considerable difficulty is eXperienced in withdrawing "the drill and the drill points are frequently broken or badlydamaged.

I My improved coal drilling bit, as illus trated in the accompanying drawing, and more particularly Fig. '1 *thereof, includes the-cl'1iseling*point indicated at 5. end of-l the shank 6 of the drill is gradually reduced in thiclmess or thinned to, form this chisel, the extreme end edge of which is sharpened as at7. be-no'ted that the chiseling bit is gradually flared or increased in width from" its inner toits outer end. Upon one sideof this chiseling bit,"a tapering chipping bit or spur 8 is-lntegrally formed at the inner acute angle with relation to the bit or point" 8. The apex or spaced laterally point .of the bit these points and bit'8 and the adjacent end of the cutting edge 7 of the chisel is approximately three quarters ofan inc ,althoughthis space may be greater or less as particular circumstances and requirements may indicate to be necessary. Theouter side of the chipping bitor point 9 is inclined inwardly' and into-the side of the drill shankp I In the operation of the drill, it will be obvious that as the tW bit projectiOns or points 8 and "9' are both located upon one side of'the chiseling bit-5,1ongitudinal pres sure appliedin' the rotation of the drill will cause the points point of the bit 9' is also and inwardly from the 8. The distance between The It is to from the between the point of the merges or spurs of coal entering-11o between the opposed edges of said drill points and chisel to be chipped or broken ofi. Thus the coal is not ground into a fine powder or pulverized. The side of the drill shank which is opposite to that upon which the bit projections 8 and 9 are formed extends in a straight to the axis of the shank, to the cutting edge 7 of the chiseling bit. The drill may, therefore, be readily removed'from the hole in the mine wall, without the usual binding of the same which necessitates the expenditure of considerable manual labor in order to effect the removal of the drill. The chisel and chipping points are, therefore, relieved of pressure or strain and liability of the same being broken or otherwise damaged is avoided.

In .Fig. 2 of the drawing, I have illus trated aslightly different form of my improved drill, wherein the same is provided with a relatively short chiseling bit 10 and the spurs 8 and 9 at one side thereof in a similar manner of the device. In addition to these chipping bits or spurs however, I provide the short spur or point 11 on chiseling bit which extends at an acute angle with respect thereto. The point or apex of this bit 11, is preferably in line with the cutting edge of the chisel. drilling bit is preferably used when operating upon a course or vein of relatively hard coal, and the additional bit or spur 11 facilitates the entry of the drill point into I the face of the mine wall. WVhile I have found in actual practice that the two chipping .bits 8 and 9 are sufficient for most purposes, it is nevertheless to be understood that if desired, a greater number of these bits may be provided. The operation and effect of both forms of the drill upon the coal, is substantially the same in the ultimate result, obtained,in that the coal is chipped or broken up in particles, and is not reduced to a pulverized or finely ground condition. I

- In connection with my improved drill .point, I have provided means whereby the length of the drill rod may be readily increased as the hole in the coal wall gradually increases in depth. To this end, the shank 6 is cut away or longitudinally. recessed as at 12 on the end opposite the drill point and at the inner end of this recess, the under cut wall or shoulder 13 is formed, said undercut wall being obliquely inclined across the width of the shank. The end face of the reduced portionof the drill shank is similarly beveled or inclined as at 14. The supplementary drill rod section 15 is cut or formed upon. one of its ends in a like manner to the shank 6 to mate therewith, and adapted to be disposed upon'the same as clearly shown inI igs. 1 and 3 of the drawing. The

is further provided in line in parallel relation I pin 18 which to the above described form tlie'opposite side of the I This form of the:

stud 16to be received in a circular recess or socket 17 foimed in the corresponding portion of the drill shank. The rod section 15 its reduced end portion with an opening to receive the split is loosely disposed through an opening provided in the end of the reduced portion of the drill shank 6. It is apparent from this description, that when the reduced portions of the drill shank and the rod section 15 arelapped upon each other and disposed .in longitudinal alinement, the end of each section will engage with the under cut wall or shoulder in the other section. The pin 18 is then inserted into the opening of the rod 6 and the mating opening of the rod 15, so that said sections are rigidly held together against longitudinal .shifting movement while the pinor stud 16 effectually prevents any relative turning movement of said sections. ,Itlis manifest that any desired number of supplementary drill rod sections may be connected together in a like manner.

In Fig. 5 of the drawing, I have shown a slighty modified form ,of this joint connection between the rod sections wherein, instead of using the fastening pin or bolt 18, Iprovide a locking pin or stud 19 which is fixed to one end of a spring 20. The other end of this plate is riveted or otherwise secured to the drill rod section. In this latter form, it will be understood that the pin 16 on one rod section, engaging in the socket 17. in the other section, is retained. The latter section of the drillrod, in addition .to the socket 17, isprovided with an opening 21 to receive the spring pressed locking pin 19. This latter form of the joint has the advantage that the locking pin is rigidly secured to the drill rod section and therefore not liable to be lost when the rod sections are disconnected. On the other hand, in some instances, it may be impossible to use this form of the locking device for the rod sections in view of the fact that the holding spring for the p taken in drawing,

. it is believed that the construction, manner of operation, and several advantages of my improved coal drill will be fully and clearly understood. The invention has been thor-- oughly tested and found to overcome the deficiencies existing in similar drills at present in use. Waste of the coal by grinding the same into a fine powder or pulverized form is avoided, and the quantity of coal mined by means of the drill in a predetermined time is'greatly in eXcess of that which is possible in the use of the old forms of such drills. It will also be seenthat my improved drill may be as'cheaply manufactured as the ordinary coal drill, and owing the rod section, and another drill connectedthereto for use while the worn drill bit is being sharpened.

While I have shown and described the preferred form and construction of thevseveral structural features of my improved drill, it will be understood that the same is susceptible of considerable modifications,

therein and I therefore reserve theprivilege of resorting to all such legitimate changes as may be fairly embodied Within the spirit and scopeof the invention as claimed.

v lVhat I claim is 1. A drill of the character described including a shank having a chiseling bit formed on one end and spaced chipping pointsfornied upon one side of the shank and disposed at an angle with respect to each other, the terminals of said chipping points being spaced inwardly from the:

chiseling bit.

2. A drill of the character described including a shank having a broad, fiat chiselingbit formed upon one end, the cutting edge of which is disposed at right angles to the longitudinal axis of the shank, and spaced chipping points obliquely disposed with respectto the axis of the shank, said chipping polnts projecting from one side of the shank inwardly of the cutting edge of the chiseling bit and the outermost chipping point projecting from the bit shank at the juncture of the other chipping point with said shank, and at an, angle with respect to said latterchipping point.

In testimony whereof I hereunto aflix my signaturein the presence of two witnesses.

JOHN BLASS.

Witnesses: M. CAnLIsLn LYDDANE,

D. W. GAL

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Yatents,

Washington, D. C. i 

